Knowing device parametrer enabled

Hello, I’m using the M4L.chosser arguments & attributes for knowing the list of all parameters and its ID. The parameter I want to know is if the device is enabled or not, so is the first one of an audio filter. The problem is that using "live.property is_enabled @get 1" for knowing if its enabled or not, it doesn’t work. Does anybody know why? And what could I do for doing this?